This study attempts to reconstruct the GDP of the Lower Yangzi Delta in the beginning of the nineteenth century. It is part of a cooperative research project carried out by myself and Jan Luiten van Zanden. We have applied the same methods, standards, and measures to reconstruct the economies of the Netherlands and the Lower Yangzi Delta in the said period and then compared them. The result of my five years of work came out in my recent Chinese book (see Li 2010). This paper summarily presents my findings in English.